Experimental investigation on the penetration mechanism and kinematic behavior of drag anchors

Liu, Haixiao; Zhang, Wei; Zhang, Xinwei; Liu, Chenglin

doi:10.1016/j.apor.2010.09.004

Cited by 33 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The offshore oil and gas industry has used these anchors for both permanent and temporary moorings. Various experimental studies have been reported on drag anchors (Dunnavant and Kwan 1993;Neubecker and Randolph 1996a;Ozmutlu 2009;Liu et al 2010b;Shin et al 2011;Yu et al 2015). Similarly, analytical studies have been reported (Lelievre and Tabatabaee 1981;Degenkamp and Dutta 1989;Stewart 1992;Randolph 1995, 1996b;Thorne 1998;O'Neill et al 2003;Aubeny and Chi 2010;Liu et al 2010aLiu et al , 2012.…”

Section: Introductionmentioning

confidence: 87%

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

Fanning¹,

Sivakumar

Nanda

et al. 2023

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

One of the ways to install plate anchors in deep seabed is to drop the anchor system from the sea level and allow it to initially embed in the seabed under its own weight. Further dragging would cause the anchor to rotate and embed further into the seabed. There could be difficulties of getting the anchor plate horizontal or mooring line to be perpendicular to the plate where the maximum pullout capacity could be achieved. As part of the investigations, various aspects of the plate performance were examined through centrifuge testing in which the plate orientation and pullout angles were varied. It was presumed that dynamic stability of the anchor (during field installation) can be achieved by having the plate in biwing configuration. Therefore, the performance of the biwing anchors having different spacing between the plates was also examined in the centrifuge testing program and the findings were compared with predictions obtained through finite-element modeling (FEM). Both pullout directions and the plate angles considerably influenced the pullout capacity factors. The comparison between the predicted pullout capacity using FEM and measured pullout capacity for biwing anchors at shallow embedment depths was excellent. However, the FEM-predicted pullout capacity was noticeably lower than the measured ones for deep anchors. Pullout capacity of biwing anchors at shallow embedment depth increased as the spacing between the plates S increased from 0 to 0.5B. However, there appears to be a slight reduction in the performance in deep embedment anchors. This is also reflected in FEM findings.

show abstract

Section: Introductionmentioning

confidence: 87%

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

Fanning¹,

Sivakumar

Nanda

et al. 2023

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

show abstract

“…The holding capacity of fluke anchor is dependent on the penetration depth, thus the assessment of anchor final depth is of significance (Liu et al, 2010; Zhang et al, 2022). The pull‐out capacity of fluke anchor originates from the bearing resistance produced by the fluke, which is related to the penetration depth, soil properties, anchor size, and so forth.…”

Section: Deep‐sea Anchorsmentioning

confidence: 99%

Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

Rui

Zhang

et al. 2023

Deep Underground Science and Engineering

View full text Add to dashboard Cite

The deep‐sea ground contains a huge amount of energy and mineral resources, for example, oil, gas, and minerals. Various infrastructures such as floating structures, seabed structures, and foundations have been developed to exploit these resources. The seabed structures and foundations can be mainly classified into three types: subsea production structures, offshore pipelines, and anchors. This study reviewed the development, installation, and operation of these infrastructures, including their structures, design, installation, marine environment loads, and applications. On this basis, the research gaps and further research directions were explored through this literature review. First, different floating structures were briefly analyzed and reviewed to introduce the design requirements of the seabed structures and foundations. Second, the subsea production structures, including subsea manifolds and their foundations, were reviewed and discussed. Third, the basic characteristics and design methods of deep‐sea pipelines, including subsea pipelines and risers, were analyzed and reviewed. Finally, the installation and bearing capacity of deep‐sea subsea anchors and seabed trench influence on the anchor were reviewed. Through the review, it was found that marine environment conditions are the key inputs for any offshore structure design. The fabrication, installation, and operation of infrastructures should carefully consider the marine loads and geological conditions. Different structures have their own mechanical problems. The fatigue and stability of pipelines mainly depend on the soil‐structure interaction. Anchor selection should consider soil types and possible trench formation. These focuses and research gaps can provide a helpful guide on further research, installation, and operation of deep‐sea structures and foundations.

show abstract

“…To improve the knowledge about and understanding of anchor penetration and movement, dragging tests and anchor dropping experiments were performed . According to , and , the retention capacity and kinematic mechanisms of drag anchors have been well studied experimentally and analytically. Only a few numerical approaches exist which investigate the anchor movement and its consequences.…”

Section: Previous Research Workmentioning

confidence: 99%

Impact on submarine cables due to ship anchor – soil interaction

Osthoff

Heins

2017

Geotechnik

View full text Add to dashboard Cite

Anchors are one of the main reasons for submarine cable damage. A certain permanent burial depth is necessary if the risk of submarine cable failure due to anchor penetration into the soil is to be reduced. Two factors are important for the burial depth: the penetration depth of the anchor in the first place and the influencing depth of the anchor movement. This means that cables can be damaged either by an anchor penetrating into the subsoil and coming into direct contact with the cable or by an anchor moving above the cable but inducing a pressure load on the cable. To investigate the influence of anchor movement on a submarine cable and to derive the possible damage mechanisms, numerical simulations were conducted using the Coupled Eulerian‐Lagrangian (CEL) method.

show abstract

Experimental investigation on the penetration mechanism and kinematic behavior of drag anchors

Cited by 33 publications

References 10 publications

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

Impact on submarine cables due to ship anchor – soil interaction

Contact Info

Product

Resources

About